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PCN21B-55PC-2PF-G Equivalent & Substitute Parts
Part Overview
The PCN21B-55PC-2PF-G is a 77-position (55 + 22 Ground) backplane connector header manufactured by Hirose Electric Co Ltd. This press-fit through-hole connector operates at 1.5 A and 300V with a 2.00mm pitch across 5 + 2 rows. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring compatible backplane connectivity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | PCN21B-55PC-2PF-G |
| Manufacturer | Hirose Electric Co Ltd |
| Category | Backplane Connectors |
| Connector Type | Header, Male Pins |
| Number of Positions | 77 (55 + 22 Ground) |
| Pitch | 0.079" (2.00mm) |
| Number of Rows | 5 + 2 |
| Mounting Type | Through Hole |
| Termination | Press-Fit |
| Current Rating | 1.5 A |
| Voltage Rating | 300V |
| Operating Temperature | -55°C ~ 125°C |
| Contact Finish | Gold |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution for the PCN21B-55PC-2PF-G is determined by the following critical parameters:
77-Position Configuration (55 + 22 Ground): Direct substitutes must maintain the identical 77-position layout with 55 signal positions and 22 dedicated ground positions across 5 + 2 row arrangement.
2.00mm Pitch Press-Fit Through-Hole: All substitutes must use 0.079" (2.00mm) pitch with press-fit termination for PCB mounting compatibility.
Connector Style C 11: The connector style designation must remain consistent.
Operating Temperature Range: Substitutes must support -55°C to 125°C operation.
Backplane Connector Usage: The connector must be rated for backplane applications.
Substitutes are grouped into two categories:
Category A - Direct 77-Position Equivalents: Parts maintaining the complete 77-position configuration with identical electrical and mechanical specifications.
Category B - 55-Position Alternatives: Parts with 55 signal positions (without dedicated ground rows) for applications where the full 77-position ground structure is not required.
Parameter Comparison
| Part Number | Manufacturer | Positions | Rows | Pitch (mm) | Current (A) | Voltage | Temp Range (°C) | Contact Finish | Product Status |
|---|---|---|---|---|---|---|---|---|---|
| PCN21B-55PC-2PF-G | Hirose Electric | 77 (55+22G) | 5+2 | 2.00 | 1.5 | 300V | -55 ~ 125 | Gold | Obsolete |
| 5106081-1 | TE Connectivity | 77 (55+22G) | 5+2 | 2.00 | 1.5 | 500Vrms | -55 ~ 125 | Gold | Active |
| CP2-HC055-GA1-FJ | 3M | 77 (55+22G) | 5+2 | 2.00 | - | - | -55 ~ 125 | Gold | Active |
| CP2-HC055-GA1-KR | 3M | 77 (55+22G) | 5+2 | 2.00 | - | - | -55 ~ 125 | Gold | Active |
| CP2-HC055-GF1-KR | 3M | 77 (55+22G) | 5+2 | 2.00 | - | - | -55 ~ 125 | Gold | Active |
| 100159-1 | TE Connectivity | 55 | 5 | 2.00 | 1.5 | 500Vrms | -55 ~ 125 | Gold | Active |
| 17030551201 | HARTING | 55 | 5 | 2.00 | 1.0 | - | -55 ~ 125 | Gold/Gold-Palladium | Active |
| 17030552201 | HARTING | 55 | 5 | 2.00 | 1.0 | - | -55 ~ 125 | Gold/Gold-Palladium | Active |
| 17030552202 | HARTING | 55 | 5 | 2.00 | 1.0 | - | -55 ~ 125 | Gold/Gold-Palladium | Active |
| 17030554202 | HARTING | 55 | 5 | 2.00 | 1.0 | - | -55 ~ 125 | Gold/Gold-Palladium | Active |
| CP2-HC055-A1-KR | 3M | 55 | 5 | 2.00 | - | - | -55 ~ 125 | Gold | Active |
Engineering Selection Recommendations
Primary Substitute (77-Position Direct Equivalent):
The TE Connectivity 5106081-1 is the recommended direct substitute for the PCN21B-55PC-2PF-G. This part maintains the identical 77-position configuration (55 + 22 Ground) with 5 + 2 row arrangement and 2.00mm pitch. Both parts are press-fit through-hole connectors with gold contact finish and -55°C to 125°C operating temperature range. The 5106081-1 is currently active in production with ROHS3 compliance, providing long-term availability. The voltage rating of 500Vrms exceeds the original 300V specification, ensuring compatibility with existing designs.
Alternative 77-Position Substitutes:
The 3M MetPak CP2 series offers three 77-position variants: CP2-HC055-GA1-FJ, CP2-HC055-GA1-KR, and CP2-HC055-GF1-KR. All three maintain the 77-position configuration with 2.00mm pitch and -55°C to 125°C operation. These parts are active products with RoHS compliance. Contact finish thickness varies (10.0µin for CP2-HC055-GA1-FJ and 30.0µin for the KR variants), allowing selection based on specific reliability requirements.
55-Position Alternatives:
For applications where the dedicated ground row structure is not required, 55-position alternatives are available from TE Connectivity (100159-1), HARTING (17030551201, 17030552201, 17030552202, 17030554202), and 3M (CP2-HC055-A1-KR). These parts share the 2.00mm pitch, through-hole press-fit termination, and -55°C to 125°C operating temperature. The TE Connectivity 100159-1 maintains the 1.5 A current rating and 500Vrms voltage rating. HARTING parts are ROHS3 compliant and REACH unaffected. All 55-position alternatives are active products with established supply chains.
Frequently Asked Questions (FAQ)
Q: Can the 55-position alternatives replace the 77-position PCN21B-55PC-2PF-G?
A: 55-position parts are not direct substitutes for the 77-position configuration. Use 55-position alternatives only if your PCB layout and signal routing do not require the dedicated 22-position ground row structure. The 77-position variants (5106081-1 or 3M CP2 series) are required for direct replacement.
Q: What is the difference between the 3M CP2 variants (GA1-FJ, GA1-KR, GF1-KR)?
A: All three 3M variants maintain the 77-position configuration with identical electrical and mechanical specifications. The primary differences are contact finish thickness (10.0µin for GA1-FJ versus 30.0µin for GA1-KR and GF1-KR) and packaging designation. Select based on your reliability and contact durability requirements.
Q: Are HARTING 55-position parts compatible with the original 77-position design?
A: HARTING 55-position parts (17030551201, 17030552201, 17030552202, 17030554202) are not direct replacements for the 77-position PCN21B-55PC-2PF-G. These parts are suitable only for applications requiring 55-position connectivity without dedicated ground rows. Current rating is 1.0 A, which is lower than the original 1.5 A specification.
Q: What is the significance of the 2.00mm pitch specification?
A: The 2.00mm pitch determines PCB pad spacing and connector mating compatibility. All listed substitutes maintain this pitch, ensuring mechanical and electrical compatibility with existing PCB designs. Pitch is not interchangeable; connectors with different pitch values cannot be used as substitutes.
Q: Does the TE Connectivity 5106081-1 require any design modifications?
A: The 5106081-1 is a direct mechanical and electrical equivalent requiring no design modifications. The higher voltage rating (500Vrms versus 300V) provides additional safety margin. Press-fit termination, pitch, position count, and row configuration are identical to the original part.
Q: Are all substitute parts RoHS compliant?
A: The TE Connectivity 5106081-1 is ROHS3 compliant. The 3M CP2 series parts are RoHS compliant. HARTING parts are ROHS3 compliant. Verify specific RoHS certification requirements for your application and regulatory jurisdiction.
Q: What is the lead time difference between active and obsolete products?
A: The original PCN21B-55PC-2PF-G is obsolete with limited remaining inventory (647 pcs). All recommended substitutes are active products with established supply chains and significantly higher inventory levels (ranging from 737 to 1615 pcs), ensuring reliable long-term availability.
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